6 



UNITED STATES NATlOiNAL MUSEUM BULLETIN 203 



ties (liriH'led forwards. Halteres wliilisli, with flic base 

 brownish and the liead very slightly yellowish. 



Legs moderate in size, yellowisii, covered with pale 

 short hairs, possessiiiir two black claws. Kront lej:;s 

 (pi. 1, fig. 13) shortest; femora reddish yellow, with 

 two blunt black spines on tlic Iwo-tliirds of the under- 

 side and one or two long bristly iiairs near apc.K of 

 upper surface; tibiae distinctly sjiorter than femora, 

 about the apical margin some yellowish-brown sliort 

 bristles; tarsi nearly as long as femora, the first segment 

 as long as the following ones togetiier, paler, the under- 

 side fiu'nishcd Willi i-ather long pale bristly hairs, re- 

 maining segnienls somewhat brownish, eacli segment 

 furnislied with some black l)ristlcs at the ajiices. Mid- 

 legs (pi. I, fig. 11) longest, slender; femora longer than 

 the hind femora, reddish yellow exce|)t l)asal portion, a 

 few long hairs about the l)iisal half vent rally; tibiae 

 light reddisli yellow, much shorter than tlie femora, with 

 a distinct black apical spur; tarsi whitisli, distinctly 

 shorter tlian the tibiae, or as long as the hind tarsi, the 

 first segment somewhat longer llian the following to- 

 gether, ventrally with whitisli blunt bristly hairs and 

 a black apical bristle, the 2d to 5th segments somewhat 

 brownish, some black blunt short bristly hairs ventrally, 

 especially at the apices. Hindlegs (pi. 1, fig. 12) dis- 

 tinctly longer than the front ones; femora longest, 

 slender, reddish yellow excepting the base, along the 

 inner \eiitral margin some hairs which become longer 

 ai)ically; tibiae yellowish brown, distinctly shorter than 

 the femora, some yellowish bristles at inferior ai)ex; 

 tarsi whitisli yellow, the apical four segments l)rownisli, 

 the first segment as long as the following together, each 

 segment furnished with some black short blunt bristles 

 about the inferior apex and with whitisli blunt bristly 

 hairs ventrally, the hairs on the first segment long and 

 conspicuous. 



Ijength: Body 10 mm, wing 7.5 mm. 



HoLOTYPE.— Female, Asahikawa, near Nago, Okina- 

 wa Is., Dec. 14, 195.3, collected by Mr. K. Ilia (NIAS). 

 Somewhat allied to Mellesis apicalis Shiraki from For- 

 mosa, but it is distinctly different hi many characters. 



Genus Tetradacus .Miyakc 



Daciis (Tclradai-us) Miyako, 1919, p. 92. — Shiraki, 1933, l)]). 3.">, 

 113 (a.s subgenus). 



Tetradacus tsuneonis (.Miyake) 



Pl.ite.s 2, 3 



Dacus ferrugineus Kuwana (not Fabricius), 1911a, p. 23; 191 lb, 



p. 109. 

 Dacus (Tetradacus) tsuneonis Miyake, 1919, p. 92, pi. 2, (ig. 1, 



pi. 10, fig. 1. 

 Tetradaciia tsuneonis (Miyako). — Sliiiaki, 1933, p. 113. 



A large, dirty orange-yellow species, distinguished 

 by the long abdomen with a narrow black median 

 longitudinal sircak from base to apex, the broad yel- 

 lowish I'ostal hand of wing which has no superniimcial 

 lobe in male, and the bottle-shaped ovipositor. 



Male. — Head about as wide as the thorax, higher 

 than long, aiiout 2/3 as long as wide. Froiis (|)1. 2, fig. 9) 

 broad, distinctly but slightly widened anteriorly, 

 broadci- than eye, the anterior half conspicuously 

 elevated, with narrow shining orbits and short, shining 

 vertical call!, orange yellow, with a pair of ill-defincil 

 brownish median s])ots and two pairs of bniwuish lateral 

 spots, some short erect yellowish setae aljoul the large 

 median j)ortion; ocellar triangle small, black; luiiule 

 ((uite swollen, waxy yellowish brown; ^eliex with one 

 transverse straight c.aruia just behind the ocellar spot. 

 Face (pi. 2, fig. S) broad, coniparati\ely long, nearly 

 straight in profile, the lower porticju of llie middle area 

 distinctly transversely rugulose, with relatively bi'oad 

 parafacialia, their inner margins conspicuously ciU- 

 inated and somewhat brownish tinged, waxy orange 

 yellow, with a fine blackish line a'ong the inferior margin 

 of each antennal fovea and one pair of black oblong 

 lateral spots which are placed on the inner sides of 

 anteniuil grooves and hardly attain the mouth-edge; 

 epistoma with a minute black median spot, the lateral 

 mouth borders brownish. Back of the head (pi. 2, fig. 

 10) consi)icuously conve.x, light yellow; cheeks high, 

 with a distinct but rather small subtriangular black 

 spot just below lower angle of eye, genal groove shallow 

 but rather distinct. All bristles black, rather weak: 

 fronto-orbitals 1:2; ocellar and postverticals not 

 developed; occipital row very weak; genal Aery short. 

 Antennae (pi. 2, fig. ti) brownish yellow, comiJarafiA'ely 

 long and narrow, tlistinctly longer tlian the face; first 

 segment very slightly thickened apically, nearly as long 

 as the apical width; second segment dislincfly widened 

 toward the apex, relatively long, nearly half as long 

 as the third segment, without distinct median brislle, 

 the dorsal margin furnished with some fine bristly 

 hairs, the ventral apex with a few brown bristly hairs; 

 third segment 2/9 as wide as long, nearly the same width 

 througlioiifi with the apex rounded; arista l)la(ki^h 

 brown with the basal fourth yellowish, quite bare. 

 Palpi('])l.2,fig.7) rather large, broadest about the middle, 

 apex rounil, the dorsal margin slightly and the ventral 

 margin strongly curved, nearly 2/5 iis witlc as long, 

 yeUowish; proboscis rather small, brownish. 



Thorax I'cddish brown, oval in shape, a little shorter 

 than the abdomen. Mesonotum (pi. 3, fig. 2) moderately 

 convex, with two greyish tomentose median longitu- 

 dinal streaks, between which is a narrow lilackish 

 median stripe, the latter bifurcate in its posterior half 



